JSFiddle - React, Tailwind, and code Playground

HTML

<input id="ven_id" type="text" />
<div class="inv_item" style="background-color: blue; display: none;">
    Div content
</div

JavaScript

$("#ven_id").change(function() {
    if($(this).val()) {
        $(".inv_item").slideDown(500);
    } else {
        $(".inv_item").slideUp(500);
    }
});